Rocks
These rocks are needed to hidden object games for pc invoke several triple techs. The does zetaclear really work Rocks are hard to find, sometimes (especially the Gold Rock) and their locations (with the exception of the Black Rock) aren't listed in the Guidebooks. You'll have to hunt around for them, but they aren't that hard to get. Usually you don't have to fight monsters or anything to get them.
The Black Rock-
Invokes the triple tech "Dark Eternal". Can be equipped by Marle, Lucca or Magus as an accessory. Found in Kajar.
The Blue Rock-
Invokes the triple tech "Omega Flare". Can be equipped by Lucca, Robo or Magus.
The Silver Rock-
Invokes the triple tech "Spin Strike". Can be equipped by Frog, Robo or Ayla.
The White Rock-
Invokes the triple tech "Poyozo Dance". Can be equipped by Marle, Lucca or Ayla.
The Gold Rock-
Possibly the hardest rock to find and get. Invokes the triple tech "Grand Dream". Can be equipped by Marle, Robo or Frog. Can supposedly be found in the Denadoro Mountains if Frog is at the head of your party... supposedly. (I think the Guidebook is full of it)